[Elecraft] K3 power output instability

[Walter Underwood]

Something similar happened with my KX3. Support told me to reset and reload all the firmware, and it worked fine after that.

I recommend that you get advice from Elecraft. Their advice worked for me.

wunder
K6WRU

On Mar 13, 2013, at 8:12 PM, Arliss wrote:

> Running the low and high power TX gain calibration via the K3 Utility gave the following result:
> 
> "TX Gain calibration failed because power reading did not converge to a consistent value.  5W calibration failed."
> 
> "TX Gain calibration failed because power reading did not converge to a consistent value.  50 W calibration failed."
> 
> The low power calibration failed on 40 meters and stopped there.  The 50 W calibration failed on 160 meters and stopped there.
> 
> The radio also gave an error message: ERR TXG (Transmit gain constant out of range).
> 
> 73,  Arliss
> 
> 
> 
> Arliss,
> 
> I would suggest that you run the Transmit Gain Calibration and see if that improves the situation.
> 
> 73,
> Don W3FPR
> 
> On 3/13/2013 9:10 PM, Arliss wrote:
> >I'm experiencing a problem with instability in power output >from my K3/100.  No word back from Elecraft yet (it's only been >a few days), so I thought I'd try here.
> >
> > The problem is that at relatively low power output levels
> >(approximately 10 to 40 watts), the power output does not >remain constant.   If I engage TUNE, the power will vary >plus/minus 3 or 4 watts, then jump up briefly by as much as 10 >watts or more before resuming smaller excursions.  Although the >power variations are brief, they cause the grid protection >circuit in the amp to trip.  This behavior seems to be >independent of mode and frequency.
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--
Walter Underwood
wunder at wunderwood.org